The Fraser-Fort George Regional District will join the city in asking the provincial government to add the common tansy to its list of noxious weeds.
Directors approved the move on Thursday, about a month after city council directed staff to work with the regional district on submitting a request to the Ministry of Forests, Lands, Natural Resource Operations and Rural Development.
The designation is needed to give the bodies the authority to remove the plant from private property.
Native to Europe and Asia, they have no natural predators and can crowd out native vegetation.
There are more than 900 sites within the regional district where the plant has been found, ranging from one plant to a field nearly eight hectares in size. Within the city, 270 sites have been found of which 140 are on private property and 130 are city owned.
The plant has been declared a noxious weed within five regional districts around the province, including the Bulkley-Nechako Regional District.